From 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:53:30 +0200 Subject: Adding upstream version 8.4.4. Signed-off-by: Daniel Baumann --- pimd/pim_zebra.c | 569 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 569 insertions(+) create mode 100644 pimd/pim_zebra.c (limited to 'pimd/pim_zebra.c') diff --git a/pimd/pim_zebra.c b/pimd/pim_zebra.c new file mode 100644 index 0000000..abab17f --- /dev/null +++ b/pimd/pim_zebra.c @@ -0,0 +1,569 @@ +/* + * PIM for Quagga + * Copyright (C) 2008 Everton da Silva Marques + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#include "if.h" +#include "log.h" +#include "prefix.h" +#include "zclient.h" +#include "stream.h" +#include "network.h" +#include "vty.h" +#include "plist.h" +#include "lib/bfd.h" + +#include "pimd.h" +#include "pim_pim.h" +#include "pim_zebra.h" +#include "pim_iface.h" +#include "pim_str.h" +#include "pim_oil.h" +#include "pim_rpf.h" +#include "pim_time.h" +#include "pim_join.h" +#include "pim_zlookup.h" +#include "pim_ifchannel.h" +#include "pim_rp.h" +#include "pim_igmpv3.h" +#include "pim_jp_agg.h" +#include "pim_nht.h" +#include "pim_ssm.h" +#include "pim_vxlan.h" +#include "pim_mlag.h" + +#undef PIM_DEBUG_IFADDR_DUMP +#define PIM_DEBUG_IFADDR_DUMP + +struct zclient *zclient; + + +/* Router-id update message from zebra. */ +static int pim_router_id_update_zebra(ZAPI_CALLBACK_ARGS) +{ + struct prefix router_id; + + zebra_router_id_update_read(zclient->ibuf, &router_id); + + return 0; +} + +static int pim_zebra_interface_vrf_update(ZAPI_CALLBACK_ARGS) +{ + struct interface *ifp; + vrf_id_t new_vrf_id; + struct pim_instance *pim; + struct pim_interface *pim_ifp; + + ifp = zebra_interface_vrf_update_read(zclient->ibuf, vrf_id, + &new_vrf_id); + if (!ifp) + return 0; + + if (PIM_DEBUG_ZEBRA) + zlog_debug("%s: %s updating from %u to %u", __func__, ifp->name, + vrf_id, new_vrf_id); + + pim = pim_get_pim_instance(new_vrf_id); + + if_update_to_new_vrf(ifp, new_vrf_id); + + pim_ifp = ifp->info; + if (!pim_ifp) + return 0; + + pim_ifp->pim->mcast_if_count--; + pim_ifp->pim = pim; + pim_ifp->pim->mcast_if_count++; + + return 0; +} + +#ifdef PIM_DEBUG_IFADDR_DUMP +static void dump_if_address(struct interface *ifp) +{ + struct connected *ifc; + struct listnode *node; + + zlog_debug("%s %s: interface %s addresses:", __FILE__, __func__, + ifp->name); + + for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) { + struct prefix *p = ifc->address; + + if (p->family != AF_INET) + continue; + + zlog_debug("%s %s: interface %s address %pI4 %s", __FILE__, + __func__, ifp->name, &p->u.prefix4, + CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY) + ? "secondary" + : "primary"); + } +} +#endif + +static int pim_zebra_if_address_add(ZAPI_CALLBACK_ARGS) +{ + struct connected *c; + struct prefix *p; + struct pim_interface *pim_ifp; + + /* + zebra api notifies address adds/dels events by using the same call + interface_add_read below, see comments in lib/zclient.c + + zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD, ...) + will add address to interface list by calling + connected_add_by_prefix() + */ + c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); + if (!c) + return 0; + + pim_ifp = c->ifp->info; + p = c->address; + + if (PIM_DEBUG_ZEBRA) { + zlog_debug("%s: %s(%u) connected IP address %pFX flags %u %s", + __func__, c->ifp->name, vrf_id, p, c->flags, + CHECK_FLAG(c->flags, ZEBRA_IFA_SECONDARY) + ? "secondary" + : "primary"); + +#ifdef PIM_DEBUG_IFADDR_DUMP + dump_if_address(c->ifp); +#endif + } + +#if PIM_IPV == 4 + if (p->family != PIM_AF) + SET_FLAG(c->flags, ZEBRA_IFA_SECONDARY); + else if (!CHECK_FLAG(c->flags, ZEBRA_IFA_SECONDARY)) { + /* trying to add primary address? */ + pim_addr primary_addr = pim_find_primary_addr(c->ifp); + pim_addr addr = pim_addr_from_prefix(p); + + if (pim_addr_cmp(primary_addr, addr)) { + if (PIM_DEBUG_ZEBRA) + zlog_warn( + "%s: %s : forcing secondary flag on %pFX", + __func__, c->ifp->name, p); + SET_FLAG(c->flags, ZEBRA_IFA_SECONDARY); + } + } +#else /* PIM_IPV != 4 */ + if (p->family != PIM_AF) + return 0; +#endif + + pim_if_addr_add(c); + if (pim_ifp) { + struct pim_instance *pim; + + pim = pim_get_pim_instance(vrf_id); + if (!pim) { + if (PIM_DEBUG_ZEBRA) + zlog_debug("%s: Unable to find pim instance", + __func__); + return 0; + } + + pim_ifp->pim = pim; + + pim_rp_check_on_if_add(pim_ifp); + } + + if (if_is_loopback(c->ifp)) { + struct vrf *vrf = vrf_lookup_by_id(vrf_id); + struct interface *ifp; + + FOR_ALL_INTERFACES (vrf, ifp) { + if (!if_is_loopback(ifp) && if_is_operative(ifp)) + pim_if_addr_add_all(ifp); + } + } + return 0; +} + +static int pim_zebra_if_address_del(ZAPI_CALLBACK_ARGS) +{ + struct connected *c; + struct prefix *p; + struct vrf *vrf = vrf_lookup_by_id(vrf_id); + + if (!vrf) + return 0; + + /* + zebra api notifies address adds/dels events by using the same call + interface_add_read below, see comments in lib/zclient.c + + zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE, ...) + will remove address from interface list by calling + connected_delete_by_prefix() + */ + c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id); + if (!c) + return 0; + + p = c->address; + + if (PIM_DEBUG_ZEBRA) { + zlog_debug( + "%s: %s(%u) disconnected IP address %pFX flags %u %s", + __func__, c->ifp->name, vrf_id, p, c->flags, + CHECK_FLAG(c->flags, ZEBRA_IFA_SECONDARY) + ? "secondary" + : "primary"); +#ifdef PIM_DEBUG_IFADDR_DUMP + dump_if_address(c->ifp); +#endif + } + + if (p->family == PIM_AF) { + struct pim_instance *pim; + + pim = vrf->info; + pim_if_addr_del(c, 0); + pim_rp_setup(pim); + pim_i_am_rp_re_evaluate(pim); + } + + connected_free(&c); + return 0; +} + +void pim_zebra_update_all_interfaces(struct pim_instance *pim) +{ + struct interface *ifp; + + FOR_ALL_INTERFACES (pim->vrf, ifp) { + struct pim_interface *pim_ifp = ifp->info; + struct pim_iface_upstream_switch *us; + struct listnode *node; + + if (!pim_ifp) + continue; + + for (ALL_LIST_ELEMENTS_RO(pim_ifp->upstream_switch_list, node, + us)) { + struct pim_rpf rpf; + + rpf.source_nexthop.interface = ifp; + rpf.rpf_addr = us->address; + pim_joinprune_send(&rpf, us->us); + pim_jp_agg_clear_group(us->us); + } + } +} + +void pim_zebra_upstream_rpf_changed(struct pim_instance *pim, + struct pim_upstream *up, + struct pim_rpf *old) +{ + if (old->source_nexthop.interface) { + struct pim_neighbor *nbr; + + nbr = pim_neighbor_find(old->source_nexthop.interface, + old->rpf_addr); + if (nbr) + pim_jp_agg_remove_group(nbr->upstream_jp_agg, up, nbr); + + /* + * We have detected a case where we might need + * to rescan the inherited o_list so do it. + */ + if (up->channel_oil->oil_inherited_rescan) { + pim_upstream_inherited_olist_decide(pim, up); + up->channel_oil->oil_inherited_rescan = 0; + } + + if (up->join_state == PIM_UPSTREAM_JOINED) { + /* + * If we come up real fast we can be here + * where the mroute has not been installed + * so install it. + */ + if (!up->channel_oil->installed) + pim_upstream_mroute_add(up->channel_oil, + __func__); + + /* + * RFC 4601: 4.5.7. Sending (S,G) + * Join/Prune Messages + * + * Transitions from Joined State + * + * RPF'(S,G) changes not due to an Assert + * + * The upstream (S,G) state machine remains + * in Joined state. Send Join(S,G) to the new + * upstream neighbor, which is the new value + * of RPF'(S,G). Send Prune(S,G) to the old + * upstream neighbor, which is the old value + * of RPF'(S,G). Set the Join Timer (JT) to + * expire after t_periodic seconds. + */ + pim_jp_agg_switch_interface(old, &up->rpf, up); + + pim_upstream_join_timer_restart(up, old); + } /* up->join_state == PIM_UPSTREAM_JOINED */ + } + + else { + /* + * We have detected a case where we might need + * to rescan the inherited o_list so do it. + */ + if (up->channel_oil->oil_inherited_rescan) { + pim_upstream_inherited_olist_decide(pim, up); + up->channel_oil->oil_inherited_rescan = 0; + } + + if (up->join_state == PIM_UPSTREAM_JOINED) + pim_jp_agg_switch_interface(old, &up->rpf, up); + + if (!up->channel_oil->installed) + pim_upstream_mroute_add(up->channel_oil, __func__); + } + + /* FIXME can join_desired actually be changed by pim_rpf_update() + * returning PIM_RPF_CHANGED ? + */ + pim_upstream_update_join_desired(pim, up); +} + +__attribute__((unused)) +static int pim_zebra_vxlan_sg_proc(ZAPI_CALLBACK_ARGS) +{ + struct stream *s; + struct pim_instance *pim; + pim_sgaddr sg; + size_t prefixlen; + + pim = pim_get_pim_instance(vrf_id); + if (!pim) + return 0; + + s = zclient->ibuf; + + prefixlen = stream_getl(s); + stream_get(&sg.src, s, prefixlen); + stream_get(&sg.grp, s, prefixlen); + + if (PIM_DEBUG_ZEBRA) + zlog_debug("%u:recv SG %s %pSG", vrf_id, + (cmd == ZEBRA_VXLAN_SG_ADD) ? "add" : "del", &sg); + + if (cmd == ZEBRA_VXLAN_SG_ADD) + pim_vxlan_sg_add(pim, &sg); + else + pim_vxlan_sg_del(pim, &sg); + + return 0; +} + +__attribute__((unused)) +static void pim_zebra_vxlan_replay(void) +{ + struct stream *s = NULL; + + /* Check socket. */ + if (!zclient || zclient->sock < 0) + return; + + s = zclient->obuf; + stream_reset(s); + + zclient_create_header(s, ZEBRA_VXLAN_SG_REPLAY, VRF_DEFAULT); + stream_putw_at(s, 0, stream_get_endp(s)); + + zclient_send_message(zclient); +} + +void pim_scan_oil(struct pim_instance *pim) +{ + struct channel_oil *c_oil; + + pim->scan_oil_last = pim_time_monotonic_sec(); + ++pim->scan_oil_events; + + frr_each (rb_pim_oil, &pim->channel_oil_head, c_oil) + pim_upstream_mroute_iif_update(c_oil, __func__); +} + +static void on_rpf_cache_refresh(struct thread *t) +{ + struct pim_instance *pim = THREAD_ARG(t); + + /* update kernel multicast forwarding cache (MFC) */ + pim_scan_oil(pim); + + pim->rpf_cache_refresh_last = pim_time_monotonic_sec(); + ++pim->rpf_cache_refresh_events; + + // It is called as part of pim_neighbor_add + // pim_rp_setup (); +} + +void sched_rpf_cache_refresh(struct pim_instance *pim) +{ + ++pim->rpf_cache_refresh_requests; + + pim_rpf_set_refresh_time(pim); + + if (pim->rpf_cache_refresher) { + /* Refresh timer is already running */ + return; + } + + /* Start refresh timer */ + + if (PIM_DEBUG_ZEBRA) { + zlog_debug("%s: triggering %ld msec timer", __func__, + router->rpf_cache_refresh_delay_msec); + } + + thread_add_timer_msec(router->master, on_rpf_cache_refresh, pim, + router->rpf_cache_refresh_delay_msec, + &pim->rpf_cache_refresher); +} + +static void pim_zebra_connected(struct zclient *zclient) +{ +#if PIM_IPV == 4 + /* Send the client registration */ + bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, router->vrf_id); +#endif + + zclient_send_reg_requests(zclient, router->vrf_id); + +#if PIM_IPV == 4 + /* request for VxLAN BUM group addresses */ + pim_zebra_vxlan_replay(); +#endif +} + +static void pim_zebra_capabilities(struct zclient_capabilities *cap) +{ + router->mlag_role = cap->role; + router->multipath = cap->ecmp; +} + +static zclient_handler *const pim_handlers[] = { + [ZEBRA_INTERFACE_ADDRESS_ADD] = pim_zebra_if_address_add, + [ZEBRA_INTERFACE_ADDRESS_DELETE] = pim_zebra_if_address_del, + + [ZEBRA_NEXTHOP_UPDATE] = pim_parse_nexthop_update, + [ZEBRA_ROUTER_ID_UPDATE] = pim_router_id_update_zebra, + [ZEBRA_INTERFACE_VRF_UPDATE] = pim_zebra_interface_vrf_update, + +#if PIM_IPV == 4 + [ZEBRA_VXLAN_SG_ADD] = pim_zebra_vxlan_sg_proc, + [ZEBRA_VXLAN_SG_DEL] = pim_zebra_vxlan_sg_proc, + + [ZEBRA_MLAG_PROCESS_UP] = pim_zebra_mlag_process_up, + [ZEBRA_MLAG_PROCESS_DOWN] = pim_zebra_mlag_process_down, + [ZEBRA_MLAG_FORWARD_MSG] = pim_zebra_mlag_handle_msg, +#endif +}; + +void pim_zebra_init(void) +{ + /* Socket for receiving updates from Zebra daemon */ + zclient = zclient_new(router->master, &zclient_options_default, + pim_handlers, array_size(pim_handlers)); + + zclient->zebra_capabilities = pim_zebra_capabilities; + zclient->zebra_connected = pim_zebra_connected; + + zclient_init(zclient, ZEBRA_ROUTE_PIM, 0, &pimd_privs); + if (PIM_DEBUG_PIM_TRACE) { + zlog_notice("%s: zclient socket initialized", __func__); + } + + zclient_lookup_new(); +} + +void pim_forward_start(struct pim_ifchannel *ch) +{ + struct pim_upstream *up = ch->upstream; + uint32_t mask = 0; + + if (PIM_DEBUG_PIM_TRACE) + zlog_debug("%s: (S,G)=%pSG oif=%s (%pPA)", __func__, &ch->sg, + ch->interface->name, &up->upstream_addr); + + if (PIM_IF_FLAG_TEST_PROTO_IGMP(ch->flags)) + mask = PIM_OIF_FLAG_PROTO_GM; + + if (PIM_IF_FLAG_TEST_PROTO_PIM(ch->flags)) + mask |= PIM_OIF_FLAG_PROTO_PIM; + + pim_channel_add_oif(up->channel_oil, ch->interface, + mask, __func__); +} + +void pim_forward_stop(struct pim_ifchannel *ch) +{ + struct pim_upstream *up = ch->upstream; + + if (PIM_DEBUG_PIM_TRACE) { + zlog_debug("%s: (S,G)=%s oif=%s installed: %d", + __func__, ch->sg_str, ch->interface->name, + up->channel_oil->installed); + } + + /* + * If a channel is being removed, check to see if we still need + * to inherit the interface. If so make sure it is added in + */ + if (pim_upstream_evaluate_join_desired_interface(up, ch, ch->parent)) + pim_channel_add_oif(up->channel_oil, ch->interface, + PIM_OIF_FLAG_PROTO_PIM, __func__); + else + pim_channel_del_oif(up->channel_oil, ch->interface, + PIM_OIF_FLAG_PROTO_PIM, __func__); +} + +void pim_zebra_zclient_update(struct vty *vty) +{ + vty_out(vty, "Zclient update socket: "); + + if (zclient) { + vty_out(vty, "%d failures=%d\n", zclient->sock, zclient->fail); + } else { + vty_out(vty, "\n"); + } +} + +struct zclient *pim_zebra_zclient_get(void) +{ + if (zclient) + return zclient; + else + return NULL; +} + +void pim_zebra_interface_set_master(struct interface *vrf, + struct interface *ifp) +{ + zclient_interface_set_master(zclient, vrf, ifp); +} -- cgit v1.2.3